Grinding-machine.



0. F. HENTSCHEL.

GRINDING MACHINE.

APPLICATION FILED APR. 23, I915.

Patented Jan. 11, 1916.

3 SHEETS-SHEET I.

THE COLUMBIA PLAryoGRAPH co., wAsmNu'roN. D. 5.

OFHcn iachez 0. FL HENTSCHEL.

GRINDING MACHINE. APPLICATION FILED APR. 23, 1915- Patented Jan. 11, 1916.

3 SHEETSSHEET 2.

3 3mm T'Hehische? THE COLUMBIA PLANOGRAPH c0, WASHINGTON, D. c.

O. F. HENTSCHEL.

GRINDING MACHINE.

, APPLICATION FILED APR. 23, 1915.

1.,168,206, Patented Jan. 11, 1916.

3 SHEETSSHEET 3.

THE COLUMBIA PLANDGRAPH c0.. WASHINGTON, n. c.

OSCAR F. HENTSCHEL, OF MICHIGAN CITY, INDIANA.

GBINDING-MAGI-IINE.

Application filed April 23, 1915.

To all whom it may concern Be it known that 1 Oscar: F. HENTSCHEL, a citizen of the United States, residing at Michigan City, in the county of Laporte and State of Indiana, have invented certain new anduseful Improvements in Grinding-llachines; and I do hereby declare the follow ing to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The primary ob ect of this invention is to provide a grlnding machine which is automatic in operation, simple of construction and highly efficient for the purpose for which it is designed, namely, to grind cast- I ings and articles such as plow points, shovels, 6t cctem, of irregular contour.

Another object of the invention is to provide in a grinding machine of this nature a work-supporting table movable laterally and longitudinally, a rotatable and vertifor the carriage actuated by the lengthfeed table, and novel plate shifting means also actuated by the lengthfeed table to reverse the direction of movement of said last men- 'tioned table.

' An object of equal importance with those above mentioned is the provision of a casing for the grind stone and work which will effectually protect the operator of the machine against injury by a breaking grind stone and against annoyance by dust created by the grinding operation.

With these and other objects in view, as will become more apparent as the description proceeds, the invention consists in certain novel features of construction, combination and arrangement of partsas will be hereinafter more fully described and claimed.

For a complete understanding of my in- Specification of Letters Patent.

Patented Jan. 11,1916.

Serial No. 23, 104.

vention, reference is to be had to the following description and accompanying drawings, in which,

Figure 1 is a front elevation of my improved automatic grinding machine, Fig. 2 is a side elevation thereof partly in section, Fig. 3 is a vertical transverse sectional view showing the casing, the supporting table, and the grinding wheel shaft in section, Fig. & is a horizontal section on the plane of line H of Fig. 1, and Fig. 5 is a fragmentary, top plan view of the work, casing, and table.

Referring in detail to the drawings by numerals, and 11 designate the main standards of the machine which may be mounted upon any suitable base, here shown as a floor 12, and which extend in parallel relation to each other. The driving means for the grind stone include a vertical shaft 13 slidable and rotatable through bearings 14 supported on the standard 10. The shaft 13 derives its rotation from a cylinder gear 15 meshing with a spur gear 16 rigidly se= cured to the lower end thereof. The gear 15 is rigidly secured to a vertical shaft 17 which extendsthrough bearings 18 and the base 12, and which carries upon its lower end a beveled gear 19 in mesh with a similar gear 20 rigid with the main horizontal drive shaft 21, which latter is journaled through hangers 23 connected to the under side of the floor 12. The shaft 21 is continuously driven by any suitable means, such as a belt, not shown, running over a pulley 24- rigidly secured thereto.

The grind stone 25 is rigidly secured to a horizontal transverse shaft 26 supported at a distance to the rear of the standard 11 and shaft 13 by a casing 27 connected to rearwardly extending arms of casings 2S and 29. The casing 28 is slidable upon the shaft 13 and is formed with a gear chamber 80 surrounding the shaft 13, as clearly shown in Fig. 2, and communicating with the tubular arm 31 which connects the tubular casing 27 to the grind stone shaft. The shaft 32 is journaled through the arm 31, and carries upon its forward end a beveled gear 33 meshing with a similar gear 34 keyed to the shaft 13, carrying upon its rear end a beveled gear 35 meshing with a similar gear 36 rigidly secured to one end of thegrind stone shaft 26. as clearly shown in Fig. 3. It will be noted upon reference to this figure, that the casing 27 forms bearings for the shaft 26 and is enlarged adjacent one end to form a casing 37 for the gear 36. The two casings 28 and 29 are connected by a cross bar 38 extending between the standard 11 and shaft 13. The casings are movable vertically and carry with them the grind stone 25 and gearing therefor. Since the collar 34 is rigid with the shaft 13, the upward movement of the casings 28 causes the shaft 13 to move vertically, but the movement of the shaft 13 is not sutlicient to disconnect the gear 16 from the cylinder gear 15.

The weight of the casings 28 and 29 and of the grind stone 26 and coiiperating parts is counter-balanced by a weight 38 hung on the lever 39 pivoted intermediate its ends to a horizontal, transverse arm 40 projecting inwardly from the upper extremity of the standard 11. The rear end of the lever 39 is connected to a horizontal arm 41 projecting rearwardly from the center of the cross arm 38 by means of a link 42 and turnbuckle 43. The turn-buckle 43 includes a threaded rod which is rotated by a wheel 44, and which threads into the upper end of a arm 45 secured to the rear end of the arm 41. The arm 45 slides through an opening in the arm 41 and is secured by a set screw 45. The upper end of the rod 43 is connected by a ball and socket joint to the links 42. A wheel 46 is journaled to the lower end of the arm 45 and engages a pattern 47 positioned upon the top of a work casing generally designated 48. This casing is mounted upon the work-supporting table designated as an entirety by the numeral 49, and has slots or openings 50 formed in its side walls 51 to allow for movement of the casings 27 of the grind stone shaft. The casing 27 moves vertically and longitudinally within the openings 50. The article to be ground, indicated by the numeral 52, is positioned upon the top of the table 49 within the casing 48 directly under the pattern 47 It will be understood that the article conforms in shape to the pattern 47 and is engaged by the periphery of the grind stone 25. A suction tube 53 is connected to the casing 58 and draws from the interior thereof all dust created by the grinding operation.

Coming now to a detail description of the supporting table 49, I will state that it is oblong in shape and considerable less in width than the distance between the standard 11 and shaft 13 as will be apparent on reference to Fi 1. The table moves longitudinally and laterally between the shaft 11 and standard 13, and is supported by a laterally movable carriage designated as an entirety by the numeral 54. The carriage comprises a pair of side walls 55 formed with longitudinalinterior grooves 56 to receive tongues 57 formed on the sides of the table 49. The side Walls 55 are connected by front and rear end walls 58 and 59 respec tively, which, as shown in Fig. 2, depend below the lower edges of the side walls. The carriage is supported upon the castings 60 and 61 which extend transversely of the machine on opposite sides of the standards 10 and 11, and which are mounted upon the floor or base 12. Each casting comprises a horizontal body portion 62 supported by arms 63, said-body portion being formed on its upper side with a longitudinal groove 64 and a rack 65. The groove 64 receives tongues 66 formed upon the lower edges of the end walls 58 and 59 ofthe carriage. It will be apparent that this construction permits the carriage being moved laterally, but holds the same against longitudinal movement. A lateral movement of the carriage is effected by a rotation of the pinions 67 which are in mesh with the rac (s and which are rigidly secured to a longitudinal shaft 68 journaled throu h the depending end walls 58 and 59 of tie carriage. The ratchet wheel 69 is rigidly secured to the forward end of the shaft 68 and to the out side of the wall 58 and is rotated by a pawl 70 pivoted to the lower end of a lever 71. As shown in Fig. l, the lever 71 is pivoted intermediate its end to one side of the carriage in such wise as to work the pawl longitudinally when oscillated. A wedge-shaped trip 72 projects from the forward end of the table 49, and as the table approaches the forward end of its path, the wedge strikes the inner edge of the lever 72 and forces the end of said lever outwardly, causing the pawl 70 to move inwardly and rotate the ratchet 69 so that the pinions 67 will move a slight distance along the racks 65 carryin With them the carriage. lVhen the wedge 72 withdraws from engagement with the lever 71, said lever is returned to its normal position by a. contractile, spiral spring 73.

Coming now to the drive means for the table 49, 74 indicates a cylinder gear jour naled in bracket 75 mounted upon the base .12. The gear extends transversely of the machine through openings7 6 formed in the sides of the carriage 54 and engages racks 77 carried longitudinally on the under side of the table 49. The gear 74 iscarried by a shaft 78 which is driven from the main drive shaft 21. Pulleys 79, 80, 81 and 82 are carried by the shaft 78 and are connected to corresponding pulleys 83, 84, 85, and 86 on the drive shaft 21 by belts 87 and 88. Pulleys and 81 are tight upon the shaft 78 and the pulleys 79 and 82 are loose pulleys. The belt 87 turns the cylinder gear 74 to carry the table 49 rearwardly for a cutting stroke, and the belt 88 returns the table rapidly to its forward positon. The automatic belt-shifting means which I employ, is operated by the table 49 and includes a pair of levers 88 and 89 having horizontal arms pivoted intermediate their ends, and a bar 90 supportedby brackets 91 connected to the ends of the castings 60 and 61. The vertical arms of the levers 88 and 89 extend upwardly fromthe inner terminals of the horizontal arm'and are formed with sleeves 92 through which are threaded adjusting rods 93 and 94L for engagement by the ends of the table as. It will be noted upon reference to Fig. at that the adjusting rods 93 and-9-it are positioned centrally between the standard 11 and shaft 13 so that they will always be engaged by the table 4L9 irrespective of its lateral movement. The outer ends of the levers 88 and 89 are connected by a bar 95 which when moved longitudinally, oscillates a bellcrank lever 96 connected to a shift bar 97 having arms 98 connecting the belts 87 and 88. In order that a complete shift of the belt will be made, I provide a. lever 99 pivotally supported on an arm 100 and fastened to the bar 95 by a pin and slot connection. The free terminal of the long arm 11 carries a weight 101.

Having described the construction of my automatic grinding machine, I will now proceed to a brief description of the operation thereof. The work 52, indicated by dotted lines in Fig. 2, is first placed within the casing 18 through the door -18 and then the pattern 47, which conforms in shape to that of the work, is blaced on top of the easing directly over the article to be ground. The arm 45 is next adjusted so as to bring the grind stone :25 in proper contact with the work. This adjustment is made by loosening the set screw %5, but if only fine adjustment is necessary it may be made by a rotation of the rod 43. When the machine is started by applying power to the pulley 24 in the direction indicated by arrow in Fig. l. the carriage is adjacent the standard 11.. The rotation of the main drive shaft 21 is transmitted to the grind stone 25 by means of a gearing heretofore described, so as to continually rotate said grind stone in the direction a indicated by the arrow in Fig. 2. As illustrated in the drawing, the work table is about to commence its return movement toward the rear end of the machine to produce acutting or working stroke. When the rear terminal of the table strikes the rod 93, the connecting bar 95 is shifted longitudinally. oscillating the bellcrank lever 96, which in turn shifts the rod 97 to cause the belt to be shifted, the belt 80 shifting to the loose pulley 79 and belt 88 shifted to the tight pulley 81. This shift of the belt causes the cylinder gear 7a to be reversed and return the table 49 to the forward end of the carriage. Before the table 49 reaches the end of its forward movement, the wedge 72 strikes the lever 71., causing the carriage to be shifted laterally to bring the fresh portion of the work under the grind stone when the table moves rearwardly a second time. After the cross feed has been actuated, the forward end of the table strikes the rod 91- and shiftsthe bar 95 longitudinally, causing the bellcrank lever 96 to move the shift bar 95 so as to return the belt to the first position so that the table will be carried rearwardly for another stroke. The weighted lever 99 insures a complete and proper shifting of the belt. As before stated the openings 50 and the casing 48 allow said casing to be moved longitudinallyand also allow for avertical movement of the grind stone which is caused by a varying thickness of the work being ground. After the entire surface of the work has once been ground, another adjustment of the grind stone is made by means of the rod 43.

From the foregoing description taken in connection with the accompanying drawings, it will be apparent that I have provided a very simple and practical automatic grinding machine which may be used for grinding various articles of irregular conformation, which will remove the dust from the vicinity of the machine and which will protect the operator should the grind stone break.

lVhile I have shown and described the preferred embodiment of my invention, it will be understood that minor changes in construction. combination, and arrangement of parts may be made without departing from the spirit and scope of the invention as claimed.

Having thus described my invention, I claim:

1. In an automatic grinding machine, a laterally movable carriage supporting means for said carriage formed with rack bars a shaft j ournaled through the carriage, pinionsrigid with said shaft and meshing with the rack bars, a table movable longitudinally on the carriage, and means actuated by the table for rotating the pinion.

In an automatic grinding machine. a laterally movable carriage. supporting means for said carriage formed with. rack bars, a shaft journaled through the carriage and extending transversely of the rack bars pinions rigid with the shaft and meshing with said rack bars, a table slidably supported by the table when it reaches one end. of its path to rotate the shaft.

3. In an automatic grinding machine, a laterally movable carriage. supporting means for Said carriage, a rack bar, a shaft journaled to the carriage and extending across said rack bar, a pinion rigid with the shaft and meshing with the rack bar, a table slidably connected to the carriage and movable in the direction at right angles to the path of movement of the carriage a ratchet wheel connected to said shaft. a pivoted lever. a. pawl pivotally connected to said lever and engaging the ratchet wheel, and a trip for the carriage operated by the table, drive means for the table, and reversing mechanism for said drive means, the reversing mechanism being automatically operated by the table at each end of its stroke.

6.In an automatic grinding machine, a carriage, a table slidably mounted on said carriage, a gear extending at right angles to the table, a rack bar carried by the table in mesh with sald gear, a pair of belts for drivingthe gear in opposite directions, and a belt shifter having a pair of pivoted arms projecting into the path of the table, a bar connecting said arms, and a shift rod actuated by a movement of the bar.

'7. In an automatic grinding machine, a reciprocatory table, a shaft extending transversely across said table, supporting means for said shaft permitting the latter avertical and rotary motion, a grind stone rigid with the shaft, means for rotating the grind stone, and means for moving the grind stone toward and away from the table.

8. In an automatic grinding machine, a reciprocatory table, a casing mounted thereon having openings in the sides thereof, a shaft extending transversely of the table through said openings, a grind stone rigid with the shaft, supporting means for the shaft, and pattern-controlled means for moving the shaft toward and away from the table.

. 9. In a grinding machine, a reciprocatory table to support the work, a casing mounted Copies of this patent may be obtained for five cents each, by addressing the Commissionen'of fatents.

pattern mounted on top of the casing, suportin means for the rind stone shaft and means engaging the pattern for moving the supporting means toward and, away from the table. 10. In an automatic grinding machine,a drive shaft movable longitudinally, a grind stone shaft extending in a plane at right angles to the plane of the drive shaft, gearings connecting the two shafts, supporting means for said gearing, a grind stone shaft, and means whereby a movement of the first mentioned means will cause a longitudinal movement of thedrive shaft. 7

11. In a machine of the character described, a vertical drive shaft movable longi tudinally, a casing surrounding the shaft having a gear chamber,a gear rigid with the shaft within said chamber, a second casing carried by the first mentioned casing, a grind stone shaft rotatable in the second mentioned casing, gearing for driving the grind stone shaft, said gearing being driven by the first mentioned gear, and a grind stone rigidly secured to the grind stone shaft.

12. In an automatic grinding machine, a standard, a shaft paralleling said standard, a means for rotating the shaft, a casing surs. rounding the shaft, means for causing the shaft to move longitudinally with the casing, a second casing supported by the first-men tioned casing in a plane at right angles thereto, a grind stone shaft rotatable in the second mentioned casing, a grind stone rigid with the grind stone shaft, an arm connected rigidly to the first mentioned casing and slidably connected to the standard, and means supported by said arm for moving the first mentioned casing longitudinally.

In testimony whereof I afliX my signature in presence of two witnesses.

OSCAR F. HENTSCHEL. Witnesses: J. J. WATSON,

WM. Sonmznuu.

Washington, D. C. 

